Apparatus for manufacturing porcelain jacket-crowns



C. NlSHI.

APPARATUS FOR MANUFACTURWG PORCELAIN JACKET CROWNS. v

APPLICATION FILED FEB. 14. 921.

1,382,010, PatentedJune 21, 1921.

WITNESS INVENTQR a 5 mm (/ZOfO/fl/ A/u/z/ A; ATTORNEYS 'LnnransrarrsGHOTOKU WISE-II, 0F Sf-JT FRANCESCO, CALIFOEHIEA.

earner err Original application filed March To all whom it may concern:

Be it known that l, Cr-rorono Nrsnr, a subject of the Emperor of Japan,and a resident of the city and county of. San Francisco and State ofCalifornia, have in vented a certain new .and useful Apparatus forManufacturing Porcelain Jacket- Urowns, of which the following isaspeciiication.

The invention relates to dentistry and particularly to an apparatus formanufacturing porcelain jacket crowns.

An object of the invention is to provide an apparatus of a constructionwhereby every dentist may manufacture his own porcelain jacket crowns.

A further object of the invention is to provide a simple apparatus forthe manufacture of porcelain jacket crowns.

The invention possesses advantageous features, some of which, with theforegoing, V

will be set forth at length in thefollowing description where I shalloutline in full that form of the invention which I have selected'fordescription and illustration in the accompanying specification anddrawings. V

Referring to said drawings:

Figure 1 is a perspective of the cement die of the tooth stump with theflat surfaced root portion.

Fig. 2 is a perspective of the cement die with the platinum foil matrixthereon.

Fig. 3 is a side view of the articulator with the cement die therein,the stump beingcovered with the wax crown model.

Fig. 1 is a front view of the cement die with the wax crown thereon.

Fig. 5 is a perspective of the porcelain mold forming device.

Fig. (3 is a side view of the cement die with the wax crown thereon.

Fig. 7 is a longitudinal section through the mold forming device withthe porcelain mold in place.

My Patent No. 1,372,772 of March 29,

1921, explains a method for making porcelain jacket dental crowns andthe present specification discloses an apparatus for the practice of themethod.

In that method a cement die 2, and stump 3, is made of the root whichstump is also provided with the root portion 1. This root portion ispreferably rectangular in shape Specification of Letters Patent.Paigvgmtgd Jpn me $511 a (m o i is 22, 1920, Serial No. 367,842. ruary14-, 1921. Serial No. 444,766.

drf/lln Divided and this applicationfiled Feband has one of its faces,as 5 parallel with the labial or buccal side of the tooth.

A plaster model 6, is made of adjacent teeth and mounted on anarticulator 7, in opposition to a wax bite 8. The root portron is thencut from the plaster model and the band and modeling compound removedtherefrom and the cement die trimmed the sides of the root portion tothe desired shape. There is thus provided a cement die or duplicate ofthe stump, with a root portron hav ng flat side faces. On the labial orbpc'cal side 5, of the root portion, is an ioentiiiylng marlr, suchasthe cross 9.

"On the stump is a platinum foil matrix 12, which extends down over theupper edge of the root portion. The cement die, with the matr x, is thenplaced in the plaster model 6, in the articulator, in opposition to thewax bite 8, and with tie marked side forward, and the desired shape ofthe tooth 18 built up on tie matrix ii ithstiff wax, such asinlay wax,using the wax bite and tl e plaster models of the adjacent teeth, to

obtain the proper contour of the wax tooth 13.

T he cement die with the wax model 13, of the jacket crown is thenremoved from the artlculator and a sheet of metal foil 14, such as tinfoil, is burnished over the labial or buccal side of the model die.

From this it will be seen that I produce a model of the crown which isused with the appa *atus as follows:

The model die is adapted to be pressed into modeling compound 15,contained in an open end tray 16, the compound being heated so that itis soft. The labial or buccal side of the model die, indicated by thecross, is pressed into the modeling compound to about one-half the depthof the model die, or so that a complete impression 17, of the markedside of the model die is formed. 'The end of the wax model preferablyextends slightly from the open end of the tray. A sheet of tin foil 18,is adapted to be burnished over the projecting edge or ocolusal surface19, of the wax model.

Secured to the tray are guideways 21, on which a slide 22, is mounted tolide back and forth, a clamp screw 23, being provided for looking it inplace; The slide is adapted to be filled with modeling compound 24,which is heated until it is soft, and the slide is then with anessential oil, preferably oil of cloves,

to prevent the porcelain from sticking. The platinum matrix is thenremoved from the cement die, the wax model is melted therefrom and thematrix placed back on the cement die, the stump having been painted withVaseline to seal the joint between the edge of the matrix and the die.The cement die with the matrix is then placed into the tin foil 14, inthe tray, with the marked side down, and the ate with its ocolusalimpression is moved against the tray and locked in position. i

This is a division of my application, Serial Number 367,842, filed March22, 1920, which eventuated in the above mentioned patent.

VJhat is claimed is:

1. An apparatus for making porcelain 'jacket crowns, comprising a trayopen at one end and adapted to contain modelingcompound, a guide securedto the tray and extending therefrom at the open end and a slide adaptedto contain modeling compound mountedon said-guide and movable intocooperative relation with said tray.-

2. An apparatus for making porcelain jacket crowns, comprising separablewaxholding parts having open opposed ends, one section for holding atooth model and the other movable to impress the occlusal surface of themodel upon the contiguous wax.

3. An apparatus for making porcelain jacket crowns, comprisingwax-holding parts with open, opposed ends, thesaid parts having guidedmovable relation so that the wax in one part may be pressed against theocclusal surface of a model in the other. a. A hand tool for the makingof porcelain jacket crowns, comprising ahandle provided with a guidedevice, and wax-holding receptacles provided upon the handle and guidedevice so that the occlusal surface of a model in one receptacle may beimpressed in the wax on the opposite receptacle.

5. A hand tool for the making of porcelain jacket crowns, comprising ahandle provided with a wax-holding tray, and a receptacle mounted on thehandle'and having an open side disposed toward the tray so that uponmovement of the opposed ends into juxtaposition the occlusal surface ofa model in the tray will be impressed in the wax in the receptacle.

6. A. molding apparatus consisting of opposed receptacles for ductilematrix material, said receptacles having guided relative movement sothat an impression may be made in the material, in one receptacle, froma model placed in the other. i

In testimony whereof, I have hereunto set my hand. 7 v

. CHOTOKUNIS HI.

